Top quality premium tennis ball for all court, provide great speed and spin, EN core technology, excellent durable rubber and felt cover, new packaging for recycling to save our environment, official ball used in numerous ATP tournaments. 58/59 grams average weight, medium weight not too heavy or too light for comfort, 65mm diameter. 4 balls for £7.00. 8 balls for £12.00. 12 balls for £17.00. 72 balls for £96.00.